如何在我的模型中执行本机查询？

Question

我需要在我的Model中定义复合外键。目前不支持它。所以，我尝试在我的模型中运行本机查询。

我有两个表（vwAlarm, vwYfUserToSiteMappings）两个表都有两列。

  

CompanyId，SITECODE

我希望通过连接两个表中的两列来返回单行。

这是我的模特;

class Alarm extends Model
{

    protected $table = 'vwAlarm';
    protected $primaryKey = 'AlarmId';

..

 public function Site()
    {
        $rec = \DB::table('vwAlarm')
            ->join('vwYfUserToSiteMappings', 'vwAlarm.SiteCode', '=', 'vwYfUserToSiteMappings.SiteCode')
            ->join('vwYfUserToSiteMappings','vwAlarm.CompanyId', '=', 'vwYfUserToSiteMappings.CompanyId')
            ->first();

        return $rec;
}

我得到了

 QueryException
SQLSTATE[42000]: [Microsoft][ODBC Driver 13 for SQL Server][SQL Server]The objects "vwYfUserToSiteMappings" and "vwYfUserToSiteMappings" in the FROM clause have the same exposed names. Use correlation names to distinguish them. (SQL: select top 1 * from [vwAlarm] inner join [vwYfUserToSiteMappings] on [vwAlarm].[SiteCode] = [vwYfUserToSiteMappings].[SiteCode] inner join [vwYfUserToSiteMappings] on [vwAlarm].[CompanyId] = [vwYfUserToSiteMappings].[CompanyId])

如何更正我的查询？

Answer 1

你应该试试这个：

 $rec = \DB::table('vwAlarm')
        ->join('vwYfUserToSiteMappings AS vwSiteCode', 'vwSiteCode.SiteCode', '=', 'vwAlarm.SiteCode')
        ->join('vwYfUserToSiteMappings AS vwCompanyId','vwCompanyId.CompanyId', '=', 'vwAlarm.CompanyId')
        ->first();

希望这对你有用!!!

Answer 2

为表名设置别名，如下所示

$rec = \DB::table('vwAlarm')
            ->join('vwYfUserToSiteMappings AS vw1', 'vwAlarm.SiteCode', '=', 'vw1.SiteCode')
            ->join('vwYfUserToSiteMappings AS vw2','vwAlarm.CompanyId', '=', 'vw2.CompanyId')
            ->first();